Causes of Bacterial Lymphadenitis

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What is the role of lipoteichoic acid in streptococci?

Mediate adherence

Which enzyme from streptococci is responsible for dissolving fibrin?

Streptokinase

What type of growth pattern is observed in Mycobacteria culture?

Serpentine cord-like growth

What is the purpose of Z.N. stain in the diagnosis of Mycobacteria?

Staining thin pink rods in a blue background Signup and view all the answers

What is the method for detecting antigens in Mycobacteria using liquid media?

BACTEC Signup and view all the answers

What is the purpose of Mantoux test in the diagnosis of tuberculosis?

To detect delayed hypersensitivity reaction Signup and view all the answers

What are the virulence factors associated with Staphylococci in bacterial lymphadenitis?

Cell wall components, enzymes, and toxins Signup and view all the answers

How do Staphylococci resist phagocytosis in bacterial lymphadenitis?

Coagulase plasma with fibrin deposition Signup and view all the answers

What are the laboratory methods used for diagnosing bacterial lymphadenitis caused by Staphylococci?

Smear staining and culture on Nutrient agar, blood agar, and mannitol salt agar Signup and view all the answers

Describe the characteristics of Group A streptococci involved in local infections.

Gram positive cocci arranged in chains, beta hemolysis on blood agar Signup and view all the answers

What is the role of M protein in the virulence of Group A streptococci?

Antiphagocytic and important for serologic classification Signup and view all the answers

How do streptococci grow on blood agar and what is a distinguishing feature of their appearance?

Beta hemolysis; catalase negative Signup and view all the answers

What are the common causative organisms of bacterial lymphadenitis?

Staphylococci, Group A streptococci, Mycobacterium, Brucella, Anaerobes, Treponema pallidum, Salmonella enteric fever Signup and view all the answers

What symptoms might indicate a patient is at risk for developing lymphadenitis?

Upper respiratory tract infection, sore throat, earache, conjunctivitis, impetigo, fever, irritability, anorexia, contact with animals (especially cats), recent dental care or poor dental health Signup and view all the answers

What physical examination findings suggest an infection in lymphadenitis?

Soft, fluctuant, tender, overlying erythema or streaking Signup and view all the answers

What laboratory study is used to evaluate bacterial etiologies in lymphadenitis?

Gram stain of aspirated tissue Signup and view all the answers

Which serological test confirms the diagnosis of infectious mononucleosis in lymphadenitis patients?

Monospot or Epstein-Barr virus (EBV) serology Signup and view all the answers

What is the purpose of performing skin testing or purified protein derivative (PPD) in lymphadenitis patients?

To confirm the diagnosis of tuberculous lymphadenopathy Signup and view all the answers